Investigation on luminescence properties and XANES of dysprosium ion doped borophosphate glasses

In this research, melt quenching was used to prepare Dy3+ ion doped alkaline borophosphate glasses. According to the XANES measurement, Dy ions in glass show +3 oxidation state, identical to the standard Dy2O3 powder. Glasses were measured for density (rho), molar volume (Vm), and refractive index (n). The absorption peaks, which are assigned to transitions from the ground state 6H15/2 to higher energy levels of Dy3+ ion in glass matrix. Four prominent emission bands were observed in luminescence spectra, which correspond to the 4F9/2 -> 6HJ (J = 15/2, 13/2, 11/2, 9/2) transitions. The Judd-Ofelt (J-O) intensity parameters follow the trend as omega 2>omega 6>omega 4 of the PBLAGdDy1.0. For the stimulated emission cross-section and branching ratio (>0.5), 4F9/2 -> 6H13/2 transition was found to be higher than other transitions. Because the decay curves of glasses with different concentrations of Dy3+ ion were found to be non-exponential, these glasses were calculated using the Inokuti-Hirayama (I-H) model. The obtained photoluminescence and decay times spectra primarily showed energy transfer effects from Gd3+ to Dy3+ ions and the calculated values of energy transfer efficiency (eta) found that the values increased, which confirms energy transfer from Gd3+ to Dy3+ ions. From this study, the current glasses could be useful in the applications of solid-state lasers, LEDs, and scintillation materials.